diff --git a/app/Http/Requests/SubscribeRequest.php b/app/Http/Requests/SubscribeRequest.php
index 02c5e135..899c6bee 100644
--- a/app/Http/Requests/SubscribeRequest.php
+++ b/app/Http/Requests/SubscribeRequest.php
@@ -24,7 +24,7 @@ class SubscribeRequest extends FormRequest
     public function rules()
     {
         return [
-            'email' => 'required|email'
+            'email' => 'required|email|unique:subscribers'
         ];
     }
 }